HYPNEI. 135 



papillose, serrulate; branch-leaves ovato-lanceolate; nerve 

 short, single or double ; sporangium oblong, cernuous ; lid 

 rostrate. — Hook, fy Wils. t. xxiv. ; Eng. Bot. t. 2297 in part. 



On rocks near waterfalls. Fruiting, but rarely, in Nov. 



Dioicous; forming thick, intricate, dark green tufts. Stems 

 procumbent, rigid, branched with pinnate branches ; the pin- 

 nules often flagelliform and rooting ; stem-leaves ovate, acu- 

 minate, sharply toothed ; branch-leaves ovato-lanceolate, ser- 

 rulate ; all opaque, papillose, with a short, broad, faint nerve ,• 

 cells of the margin and angles roundish, thick-walled, those of 

 the centre more elongated ; paraphylla ovate, acuminate, ser- 

 rate; fruitstalk \ an inch long, even; sporangium oblong, 

 cernuous, slightly curved ; lid rostrate, almost as long as the 

 sporangium. 



The leaves are far more opaque than in the last, and more 

 or less oblique, and the cell-walls thicker, though the struc- 

 ture is essentially the same. 



11. THUIDIUM, Schimp. 



Sporangium and peristome of Hypnum; leaves strongly 

 papillose, with numerous paraphylla; cells rounded, sub- 

 hexagonal, except at the base. 



The habit of the species belonging to this genus is peculiar, 

 and their separation under a distinct genus is justifiable, on 

 account of the difference of the structure of the leaves from 

 that of Hypnum. 



1. T. tamariscimim, Br. fy Schimp.; stem arched, irregu- 

 larly tripinnate ; stem-leaves cordate, concave, sulcate, acute ; 

 branch-leaves ovato-lanceolate; all slightly serrate above, 

 strongly papillose, with the nerve reaching nearly to the apex ; 

 perichsetial leaves fringed; fruitstalk even; sporangium ob- 

 long, curved ; lid rostrate. — Hook. $• Wils. t. lvii. ; Eng. Bot. 

 t. 1494. ; (Plate 8, fig. 4) ; Moug. 8f Nest. n. 41. 



